JP2002203349A - Disk table and recording and/or reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the influence of vibration, impact, etc., which are applied from the outside by performing correct centering of the disk. SOLUTION: A disk table has: a fitting member 4 into which the center hole 102 of a disk 101 fits; a table part 2 which supports the disk 101; a magnet 9 which attracts a metal plate attached to the disk 101; and a centering means 11 which is provided to a plurality of notched parts 10 formed on the fitting member 4 and pressing the inner wall part of the center hole of the disk 101 to make the center of the disk 101 and the center of the member 4 coincide by using a plurality of springs 12 arranged in the radial direction of the member 4 so that the springs can protrude or be buried. The elastic force of the springs 12 is set so that the springs are elastically displaced by the amount of projection of the springs 12 from the member 4 when the springs are pressed with a fixed pressing force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk table used for a disk recording and / or reproducing apparatus using a disk such as an optical disk or a magneto-optical disk as a recording medium, and a recording and / or reproducing apparatus using the disk table. .

[0002]

2. Description of the Related Art Conventionally, a recording and / or reproducing apparatus using a disk such as an optical disk or a magneto-optical disk as a recording medium has been used. A recording and / or reproducing apparatus using a disk of this kind as a recording medium includes a disk rotation operation mechanism for rotating the disk, and a pickup device arranged to face a signal recording surface of the disk rotated by the disk rotation mechanism. The recording or reproduction of an information signal is performed by scanning a signal recording surface of a disk that is rotated by a pickup device.

The disk rotation operation mechanism has a disk table on which the disk is positioned and mounted. The disk table is mounted on a drive shaft of a motor constituting a disk rotation operation mechanism, and is rotated by the motor. The disc table includes a fitting member that fits into a center hole provided in the center of the disc, and a table that supports the periphery of the center hole of the disc. Further, the disc table has support means for pressing and supporting the disc against the table portion. As the support means, a chucking plate which is disposed opposite to the table portion and cooperates with the table portion to hold the periphery of the center hole of the disc placed on the table portion is used.

The fitting member provided on the disk table is formed in a substantially truncated conical shape whose diameter is reduced toward the distal end. The fitting member is supported by the table so as to be movable in the axial direction of the drive shaft. Further, the fitting member is urged in the distal direction by an urging member such as a spring.

In this disk table, when the disk is placed on the table while the inner wall of the center hole is in contact with the outer peripheral surface of the fitting member, the outer peripheral surface of the fitting member has a conical shape. The inner wall portion of the center hole is pressed by the outer peripheral surface of the fitting member because the fitting member is urged in the distal direction, so that centering of the center of the drive shaft with the center of rotation of the disk is performed. Will be

[0006] When the motor is driven to rotate, the disk mounted on the disk table is rotated integrally with the disk table.

[0007]

As described above, the disk table in which the fitting member is supported so as to be movable with respect to the table portion has a complicated structure, and the assembly is complicated. Further, in this disc table, it is necessary to interpose an urging member between the fitting member and the table portion, and it is difficult to reduce the thickness of the table portion.

In order to solve such a problem, there has been proposed a disk table in which a fitting member is fixed to a table portion, thereby simplifying and reducing the thickness of the apparatus. In such a disk table, it is necessary to form the fitting member smaller than the center hole in consideration of the dimensional error of the outer diameter of the fitting member and the dimensional error of the inner diameter of the center hole of the disk. Therefore, this disk table
When the disc is placed on the table, a minute gap may be formed between the outer surface of the fitting member and the inner wall of the center hole.

If a gap is formed between the fitting member and the center hole of the disk, not only the centering of the disk with respect to the drive shaft cannot be performed satisfactorily, but also when the disk is subjected to external vibration or impact, There is a risk of movement with respect to the table.

In a recording and / or reproducing apparatus using a disk as a recording medium, if the eccentricity with respect to the drive axis of the disk is large, a light beam for writing or reading information signals on the disk cannot follow the disk. Writing or reading of an information signal cannot be performed. Also,
In this type of recording and / or reproducing apparatus, when the disk moves with respect to the table portion, a so-called track jump of the light beam occurs, and writing or reading of an information signal to or from the disk is interrupted.

The present invention has been proposed in view of the above-mentioned circumstances, and enables accurate centering of a disk used as a recording medium while simplifying and reducing the thickness of the apparatus. It is another object of the present invention to provide a disk table capable of suppressing the influence of vibration or shock applied from the outside and a recording and / or reproducing apparatus using the disk table.

[0012]

In order to solve the above-mentioned problems and to achieve the above-mentioned object, a disk table according to the present invention has an inner wall portion of a center hole of a disk slidably contacted at a front end thereof so that the disk is positioned at a center side. And a fitting member having a base end side formed in a columnar shape and a plurality of cutouts formed therearound, and a fitting member provided on a base end side of the fitting member. A table portion on which the periphery of the center hole of the disc is placed;
A magnet provided on a distal end side of the fitting member for attracting a metal plate attached to a center portion of the disc; and a magnet provided on the plurality of cutouts formed in the fitting member; Centering means for pressing the inner wall portion of the center hole of the disc by a plurality of spring portions disposed so as to be able to protrude and retract in the radial direction to match the center of the disc with the center of the fitting member, Disk attracting force by which the magnet attracts the metal plate: F Normal force of the spring portion against the inner wall portion of the center hole: N Pressing force applied to the spring portion by the collar without the center hole:
f Number of spring portions: n When the inclination angle of the outer surface portion of the spring portion with respect to the main surface portion of the disk is θ, the pressing force f calculated by f = NSinθ = (F / 6) (Sinθ / Cosθ) The spring portion is formed such that when the spring portion is pressed, the spring portion is displaced by an amount of protrusion from the fitting member on a plane including the table portion.

Here, the spring portion is formed of a metal leaf spring member. This spring part
Both side portions of the contact portion that contacts the inner wall portion of the center hole of the disk are curved in an arc shape toward the center of the fitting member.

Further, a contact member made of a synthetic tree material is provided on the tip side of the spring portion.

The present invention also provides a disk table on which a disk is mounted and which is mounted on a spindle motor and driven to rotate, and which records and / or reproduces information signals on the disk mounted and rotated on the disk table. A recording and / or reproducing apparatus having a recording and / or reproducing means for performing the recording and / or reproducing apparatus includes the disk table.

[0016]

The disc table according to the present invention has a recording and / or
Or, a disk used as a recording medium of the playback device,
The center hole is fitted to the fitting member and is supported by the table. At this time, the disk is pressed and supported by a spring portion provided on the fitting member in a state where the center of rotation is made coincident with the center of rotation of the disk table.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

First, the disk table according to the present invention comprises:
As shown in FIGS. 1 to 3, the disk table has a table section 2 fitted and supported on a drive shaft 1 of a spindle motor 5 of a disk recording and / or reproducing apparatus to which the disk table is applied. The table portion 2 is formed in a substantially disk shape with a synthetic resin material or the like, and is provided with a fitting hole 8 into which the drive shaft 1 at the center is fitted. The outer peripheral portion on the upper surface side of the table unit 2 is a disk mounting unit 3 on which a disk 101 serving as a recording medium of a recording and / or reproducing apparatus is mounted.

On the lower surface side of the table portion 2, there is provided a support portion 7 formed by projecting a peripheral portion of the fitting hole 8 downward. The support portion 7 is for ensuring that the length of the fitting hole 8 in the axial direction is longer than the thickness of the table portion 2 so that the drive shaft 1 supports the table portion 2 reliably.

Disk 1 mounted on disk table
Numeral 01, as shown in FIGS. 3 and 4, has a signal recording layer adhered to one main surface of a disk-shaped disk substrate made of a transparent material. A circular center hole 102 is formed in the center of the disk substrate. The center hole 102 is provided in the disk recording and / or reproducing apparatus for the disk 101.
Is used as a position reference when held. A peripheral portion of the center hole 102 provided in the disk substrate is formed to bulge toward the other main surface side in a stepped manner. That is, in the disk substrate, a peripheral portion surrounding the center hole 102 of one main surface portion is formed as an annular concave portion 103, and the center hole 1 of the other main surface portion is formed.
The surrounding portion surrounding 02 is an annular convex portion. The signal recording layer is formed of a metal material, a magnetic material, or the like, and records information signals.

A disk table is mounted, and a spindle motor 5 for rotating this disk table is
As shown in FIG. 2, the drive shaft 1 is attached to the lower surface side of the chassis 6 of the disk recording and / or reproducing apparatus, and projects the drive shaft 1 upward through the through hole. The chassis 1 has a disk 1 mounted on the disk mounting portion 3.
01 is written on the signal recording layer No. 01,
An optical pickup device or a magnetic head device (not shown) for reading an information signal recorded on the disk 101 is provided so as to be movable in a radial direction of the data, which is a direction in which the data signal approaches or separates from the spindle motor 5. I have.

A fitting member 4 protrudes from the center of the table 2 on the upper surface side. The fitting member 4 is formed integrally with the table 2 in a substantially truncated cone shape. The fitting member 4 has an outer diameter capable of fitting into the center hole 102 of the recording disk 101, and as shown in FIG. 4, the upper side, that is, the tip side portion is reduced in diameter toward the tip side. The tape-in portion 4a is a tapered portion 4a for pulling in the disk. The outer surface of the disk pull-in tapered portion 4a is continuous with the distal end surface of the fitting member 4 with a smooth curved surface. Further, the fitting member 4 is located on the base end side, that is,
The side near the disk mounting surface 3 is a straight cylindrical portion 4b. The cylindrical portion 4b has an outer diameter substantially equal to the inner diameter of the center hole 102 of the disk 101.

As shown in FIG. 3, an annular groove 25 is provided in the outer periphery of the fitting member 4 on the distal end surface side. The groove 25 is formed so that the center thereof coincides with the center of the fitting member 4. The fitting member 4 includes the groove 2
5, a plurality of notches 10 are provided. These notches 10 allow the fitting member 4 to be
Are formed radially over the outer peripheral side of. These notches 10 are formed at equal angular intervals about the axis of the fitting member 4.

The centering ring 11 serving as a centering means is fitted in the groove 25. The centering ring 11 is formed of a flexible and elastic synthetic resin, metal, or the like. A centering piece 12 serving as a centering member is integrally formed on the centering ring 11 so as to project outward. The centering pieces 12 are claw-shaped protruding pieces, and are radially formed at equal angular intervals corresponding to the notches 10. Each of these centering pieces 12 is provided with a notch 1
0 is engaged. These centering pieces 12
Each is formed in the shape of a leaf spring, and is capable of elastic displacement.

When the centering ring 11 is fitted in the groove 25, the centering piece 12 has its base end located near the distal end surface of the fitting member 4 and its distal end located with respect to the disk mounting surface 3. Tilt the disk mounting surface 3
Only the distal end portion protrudes outward from each notch 10, that is, in the outer peripheral direction of the fitting member 4. The tip side portions of the centering pieces 12 are formed so as to protrude toward the disk mounting surface portion 3 on the outer peripheral side of the cylindrical portion 4 b of the fitting member 4. That is, each centering piece 12 is in a state of protruding outward from the fitting member 4 at the base end side portion of the fitting member 4.
The distal end portions of the centering pieces 12 can be protruded and retracted from the respective notches 10 by elastic deformation of the base end side portions of the centering pieces 12.

In order to prevent the elastic displacement of each centering piece 12 from being hindered, an annular groove 14 enclosing the tip of each centering piece 12 is provided on the upper surface of the table section 2.

Further, a magnet mounting recess 13 is provided on the distal end surface of the fitting member 4, as shown in FIGS. The magnet mounting concave portion 13 is a circular concave portion, and is formed so that the center thereof coincides with the center of the fitting member 4. The disk 101 is provided in the magnet mounting recess 13.
Are mounted so as to be fitted with magnets 9 serving as support means. The magnet 9 is formed in a circular button shape. The magnet 9 is for attracting a metal plate (not shown) attached to the center of the disk 101 so as to close the center hole 102.

To mount the disk 101 in the disk table configured as described above, the center hole 102 of the disk 101 to be mounted is fitted into the fitting member 4 as shown in FIG. At this time, since the distal end surface of the fitting member 4 and the tapered portion 4a for drawing in the disk are continuously formed in a smooth curved surface, even if the disk 101 is eccentric with respect to the fitting member 4, While being guided to the center of the fitting member 4 while sliding the inner wall portion of the center hole 102 against the outer peripheral surface of the taper portion 4a for pulling in the disk, the base end direction of the fitting member 4 in the direction of arrow C in FIG. Moved to

When the disk 101 is moved in the direction toward the base end of the fitting member 4, the center hole 1 is moved as shown in FIGS.
The inner wall portion 02 abuts on each of the centering pieces 12.
The inner wall portion of the center hole 102 is moved in the proximal direction of the fitting member 4 while elastically deforming the centering pieces 12 so as to be immersed in the notches 10. At this time, each centering piece 12 is moved by the elastic return force into the center hole 102.
Is pressed toward the outside.

The center hole 102 of the disc 101 is fitted into the cylindrical portion 4b of the fitting member 4, and the outer peripheral portion of the center hole 102 is mounted on the disc mounting surface 3 as shown in FIG. Then, the disc 101 is centered by pressing the inner wall portion of the center hole 102 by the centering pieces 12, and the center of the center hole 102 is aligned with the axis of the fitting member 4.

At this time, the magnet 9 is
1, the metal plate attached to the disc 101 is sucked, and the disc 101 is sucked.
Is supported on the disk mounting surface 3.

As described above, when the disk 101 is positioned and mounted on the table 2 and the spindle motor 5 is driven to rotate the drive shaft 1, the disk 10
1 is rotated with the table 2. On the disk 101, an information signal is written to the signal recording layer by an optical pickup device or a magnetic head device, and an information signal recorded on the disk is read.

By the way, in order for each centering piece 12 to be accurately centered with respect to the table section 2 before the disc 101 comes into contact with the disc mounting surface section 3, the centering pieces 12 are formed in the center hole 10 of the disc 101.
It is necessary to press the inner wall portion 2 with a sufficient force. When the inner wall portion of the center hole 102 comes into contact with each centering piece 12, as shown in FIG. 5, the magnet 9 in the direction of arrow F in FIG. The vertical reaction force N of the centering piece 12 in the direction of the arrow N in FIG. 5 against the inner wall of the center hole 102 and the pressing force f applied to the centering piece 12 by the inner wall of the center hole 102 in the direction of the arrow f in FIG. I have. Here, assuming that six centering pieces 12 are provided, it is necessary that f = NSinθ = (F / 6) (Sinθ / Cosθ) (Equation 1).

In the equation (1), θ is the angle of inclination of the outer surface of the centering piece 12 with respect to the main surface of the disk 101. Then, for example, the disk suction force F is 350
If the inclination angle θ is 70 °, the pressing force f is 160 gf from f = (350/6) · Tan 70 ° = 160 (gf) (Equation 2). That is, when each centering piece 12 is pressed with a pressing force f of 160 gf or more, the amount of protrusion of the centering piece 12 from the fitting member 4 on a plane including the disk mounting surface 3 in the direction of arrow α in FIG. The elastic force may be set so that only the elastic displacement occurs. These centering pieces 12 are attached to the recording disk 101.
Is placed on the disk mounting surface 3 and is elastically displaced by a displacement equal to the amount of protrusion from the fitting member 4 on the plane including the disk mounting surface 3.

As described above, the pressing force f of about 160 gf
The centering piece 12 having such an elastic force as to be elastically displaced by the amount of protrusion from the fitting member 4 on the plane including the disk mounting surface portion 3 when pressed in the step (3) can be formed of a synthetic resin material. It is.

In the present invention, each centering piece 12 may be formed integrally with the fitting member 4, as shown in FIGS. That is, in this disc table, the fitting member 4 and the centering ring 11 are integrally formed.

Further, as shown in FIGS. 10 to 15, the disk table according to the present invention may be constituted by a plurality of clamp members 19 as support means. In this example, the disk table is configured to support the disk 101 rotatably stored in a disk cartridge. Unlike the disk 101 of the above-described embodiment, a metal plate is not attached to the disk 101 mounted on the disk table of this example.

As shown in FIG. 11, the disk cartridge has a cartridge 104 for accommodating the disk 101. The cartridge 104 is formed as a rectangular thin housing so that the disk 101 can be stored therein. That is, the cartridge 104
The upper and lower main surface portions opposing the respective main surface portions 1 are formed in a rectangular shape having sides slightly longer than the diameter of the disk 101. The disk 104 is rotatably stored in the cartridge 104.

On the lower main surface of the cartridge 104,
A circular chucking opening 108 is provided.
The chucking opening 108 is a through-hole slightly larger in diameter than the center hole 102 of the disc 101,
In addition, the periphery of the center hole 102 faces outward.

Each main surface of the cartridge 104 has a recording / reproducing opening (not shown). The recording / reproducing opening is a rectangular through hole, and the cartridge 1
It is provided from the vicinity of the center of the main surface of the cartridge 04 to the vicinity of one side of the main surface, that is, the vicinity of one side edge of the cartridge 104. The recording / reproducing opening faces outward over a part of the inner surface and outer periphery of the main surface of the disk 101. The recording / reproducing opening is used when an optical pickup device or a magnetic head device of a disk recording and / or reproducing device writes or reads an information signal to or from a signal recording layer of the disk 101. This is for allowing a head device or the like to face the disk 101.

On the inner wall of the cartridge 104, a circle which is located around the center hole 102 and opposes the main surface on one side of the disk 101 in order to regulate the amount of movement of the disk 101 in the cartridge 104 in the thickness direction. An annular ridge portion 106 and an annular ridge portion 107 facing the other main surface portion are provided to protrude.

As shown in FIG. 10, this disk table has a table unit 2 similar to the disk table described above.
have. The table portion 2 has a disk mounting surface portion 3 at an outer peripheral portion of an upper surface portion, and a fitting member 4 protrudes from a central portion of the upper surface portion. The fitting member 4 is provided with a plurality of centering pieces 12.

This disk table is rotatably supported at an intermediate portion by a fitting member 4 and has a plurality of clamp members 19,
19, 19 are attached. These clamp members 19, 19, 19 are mounted inside the clamp member mounting slit portions 15, 15, 15 provided radially on the fitting member 4, respectively. That is, each clamp member 19 is inserted into the shaft insertion hole 20 provided in the middle part.
The support shaft 17 provided in the clamp member mounting slit portion 15 is inserted and supported. The support shaft 17 is provided so that the axial direction is tangential to the circular table portion 2. Each of the clamp members 19 is formed as a substantially T-shaped member having an arm portion projecting from an intermediate portion provided with the shaft insertion hole 20 in two directions away from each other and in a direction substantially orthogonal to these two directions. ing. In these clamp members 19, one of the two-way arms separated from each other serves as a clamp 23, and an arm in a direction substantially orthogonal to the clamp 23 serves as a pressed portion 22.

In the initial state, each of the clamp members 19, 19, 19, as shown in FIG.
2 and 22 are projected radially outward of the fitting member 4 so as to face the disk mounting surface 3, and
3, 23, 23 are housed in each clamp member mounting slit 15. Each clamp member 19, 19, 19
In the initial state, since it is housed in each clamp member mounting slit 15, even if foreign matter other than the disc 101 or a finger enters the distal end side of the fitting member 4, the foreign matter or the like causes rotation. There is no risk of being manipulated or damaged.

The slit 15 for mounting each clamp member
Are formed up to the position where each pressed portion 22 of the disk mounting surface 3 faces.

A torsion coil spring 18 for urging the clamp member 19 in a direction away from the neutral rotation position of the clamp member 19 is provided between each clamp member 19 and the table portion 2. It is arranged corresponding to. These torsion coil springs 18 are provided with a locking pin 21 provided on the other of the two-way arm portions of the corresponding clamp member 19 which are separated from each other, that is, the arm portion opposed to the clamp portion 23 via the shaft insertion hole 20. , And is elastically pressed to the outside of the table portion 2. These torsion coil springs 18 engage one arm portion with a locking pin 21 of each clamp member 19 and lock the other arm portion with a locking portion 24 provided in each clamp member mounting slit 15. Let me. At this time, each of the clamp members 19, 19, 19
Each of the pressed portions 22 is rotationally urged toward the distal end of the fitting member 4 in a direction indicated by an arrow D in FIGS. 11 and 12.

The neutral rotation position of the clamp member 19 is, as shown in FIG. 13, a position rotated from the initial state described above to the direction in which the pressed portion 22 is moved to the disk mounting surface 3 side. This is the position where the locking portion 24, the locking pin 21 and the support shaft 17 are aligned. In this state, each torsion coil spring 18 presses the corresponding clamp member 19 in the direction from the locking pin 21 toward the support shaft 17 as shown by the arrow E in FIG. That is, each torsion coil spring 18 is
As shown in FIG. 11 and FIG.
11 and 12 are rotated in one direction from the neutral position, they are urged to rotate in one direction indicated by an arrow D in FIGS. 11 and 12, and as shown in FIGS. Is a position rotated in the other direction from the neutral position, the rotation is urged in the other direction indicated by an arrow G in FIGS.

When the disk 101 is lowered in the direction of arrow C in FIG. 12, the fitting member 4 is inserted into the center hole 102 of the disk 101.
Is inserted. Further, the disk 101 is provided with a mounting portion 10 at a peripheral portion surrounding the center hole 102 of the other main surface portion.
5 is brought into contact with the pressed portion 22.

When the disk 101 is moved to the disk mounting surface 3 side, as shown in FIG. 13, each clamp member 19 presses each pressed portion 22 by the mounted portion 105, and The pressed portion 22 is turned in a direction to approach the disk mounting surface portion 3 against the urging force of the coil spring 18. Then, the clamp member 19 is rotated to the neutral rotation position.

Further, when the disk 101 approaches the disk mounting surface 3, as shown in FIG. 14, each clamp member 19 presses each of the pressed portions 22 by the mounted portion 105, and The portion 22 is rotated beyond the neutral rotation position in a direction to approach the disk mounting surface portion 3. At this time, each clamp member 19 causes the pressed portions 22 to come closer to the disk mounting surface portion 3 by the pressing force of the mounted portion 105 against the pressed portions 22 and the urging force of each torsion coil spring 18. It is rotated in the direction of arrow G in FIG. In addition, the cartridge 104 is positioned at a predetermined position on the chassis 6 by abutting on the distal ends of the positioning pins 202 and 203 implanted on the chassis 6.

At this time, the table section 2 has entered the cartridge 104 via the chucking opening 108.

Each clamp member 19 is moved in a direction in which the pressed portion 22 is further brought closer to the disk mounting surface 3 by the pressing force of the mounted portion 105 against each pressed portion 22 and the urging force of each torsion coil spring 18. Is rotated. These clamp members 19 are, as shown in FIG.
Is separated from the receiving portion 105, and the clamp portion 23 is connected to the center hole 102 of the main surface on one side of the disk 101.
In contact with the concave portion 103 formed so as to surround. The disk 101 is pressed and supported on the disk mounting surface 3 by the clamp members 19. At this time, the disk 10
In 1, a centering operation is performed by each centering piece 12 of the fitting member 4.

In this state, when the spindle motor 5 rotates the drive shaft 1, the disk 101 is rotated together with the table 2. An information signal is written to the signal recording layer of the disk 101 by an optical pickup device or a magnetic head device, and the written information signal is read.

In order to remove the disk 101 from the table 2, it is sufficient to move the disk 101 together with the cartridge 104 to an upper side separated from the disk mounting surface 3. Then
In each of the clamp members 19, the clamp portion 23 is pressed upward by the disk 101, is rotated beyond the neutral rotation position, and returns to the initial state.

It should be noted that the disk table is used for storing the recording disk 10 stored in the cartridge 104 as described above.
In the case where the recording disk 101 that is not housed in the cartridge 104 as well as the recording disk 101 alone is mounted on the disk mounting surface 3, the disk 101 can be well centered and held as described above. Further, in this disk table, the number of clamp members is not limited to three as shown in the above-mentioned embodiment, but may be plural.

By the way, the plurality of centering pieces 12 serving as the centering members are not limited to those arranged in the initial state, that is, in the state where they are not elastically displaced, as in the above-described disc table. As shown, it may be arranged in a state of being elastically displaced inward, that is, on the center axis side of the fitting member 4. In this case, each of the centering pieces 12 is caused to enter the notch 10 with the tip end thereof being elastically displaced inward, and the tip is brought into contact with the inner wall of the notch 10. In contact. That is, in this disk table, the inner wall of each notch 10 is a restricting portion that restricts the return of each centering piece 12 to the initial state.

This disk table corresponds to the disk 101
When the disk 101 is lowered in the direction of arrow C in FIG. 16 and the disk 101 is mounted on the disk mounting surface portion 3 of the table portion 2, the centering pieces 12 move to the center of the disk 101 as shown in FIG. It is pressed by the inner wall of the hole 102 and elastically displaced, and also presses the inner wall. At this time, as shown by an arrow J in FIG. It is elastically displaced up to.

Since the displacement of each centering piece 12 at this time is not a displacement from the initial state, even if these centering pieces 12 have a small spring constant when these centering pieces 12 are regarded as leaf springs. , Disk 1
A sufficient pressing force corresponding to the amount of displacement from the natural state can be exerted on the inner wall portion of the center hole 102 of No. 01. Therefore, these centering pieces 12 can center the disk 101 satisfactorily. In this case, even if there is an error in the spring constant of each centering piece 12, the fluctuation of the pressing force against the inner wall portion of the center hole 102 due to the error is small. further,
In this case, each centering piece 12 is
In the initial state in which the notch 1 is not mounted, each notch 1
Since the position is regulated by the inner wall portion 0, the positioning is performed with high accuracy.

Further, the centering means constituting the disk table according to the present invention is not limited to the plurality of leaf spring-shaped centering pieces 12 as described above, and as shown in FIG. Centering pieces 1 connected to each other via a hinge portion 12a
2 and the elastic member 12b.

Each centering piece 12 of this example is a claw-shaped protruding piece, and is formed at an equal angular interval corresponding to the notch 10 and formed radially with respect to the annular portion of the centering ring 11. ing. These centering pieces 12
It is fitted in each notch 10. In the same manner as described above, the centering piece 12 has only the distal end portion protruding outward of the fitting member 4 at the base end portion of the fitting member 4. The hinge portion 12a is formed at the base end portion of each of the centering pieces 12 by making the centering pieces 12 thin. Each of the centering pieces 12 can be displaced in the retracting direction with respect to the fitting member 4 by flexibly displacing the hinge portion 12a. The elastic member 12b is formed in a substantially annular shape by using butyl rubber or another elastic material, and is interposed between each centering piece 12 and the annular portion of the centering ring 11. That is, the elastic member 12
b is fitted on the outer peripheral side of the annular portion of the centering ring 11 and supports the inner peripheral side of each centering piece 12.

This disk table corresponds to the disk 101
18 is lowered in the direction of arrow C in FIG. 18 and is mounted on the disk mounting surface 3 of the table 2, the centering pieces 12 are pressed by the inner wall of the center hole 102 of the disk 101 and the elastic member 12b while displacing it while pressing it in the direction of arrow K in FIG.
Pressing is performed by the elastic force of 2b.

Since the displacement of each centering piece 12 at this time is not an elastic displacement,
Is less likely to cause so-called creep even after repeated displacement,
Has good durability. The pressing force against the inner wall of the center hole 102 of the disc 101 is
Since the elastic member 12b is obtained by the elastic force of b, it can be made sufficient by appropriately selecting the material, the shape, and the like of the elastic member 12b. Therefore, each centering piece 12
The disk 101 can be favorably centered.

FIG. 20 shows a disk table according to the present invention.
22, 24, and 25, a centering ring 1 made of a leaf spring material made of a metal material is used.
1 may be used.

This disk table also has a table section 2 fitted and supported on a drive shaft 1 of a spindle motor 5 of a disk recording and / or reproducing apparatus. Table part 2
Is formed in a substantially disc shape from a synthetic resin material or the like, and is provided with a fitting hole 8 into which the drive shaft 1 at the center is fitted. The table 2 records and / or records the outer peripheral portion on the upper surface side.
Alternatively, it is the disk mounting section 3 on which the disk 101 serving as a recording medium of the reproducing apparatus is mounted.

As shown in FIG. 21, the spindle motor 5 includes an outer case 35, a bearing 34 supported by the outer case 35 and rotatably supporting the drive shaft 1, and a magnet support on the drive shaft 1. It has annular magnets 32, 32 attached via a member 33, and a coil substrate and the like disposed in the outer case 35 so as to face the magnets 32, 32. The spindle motor 5 supports the outer case 35 on the lower surface of the chassis 6 and
Is projected upward of the chassis 6 through a through hole provided in the chassis 6. It should be noted that the table section 2 constituting the disc table is not provided with the support section 7.

A fitting member 4 protrudes from the center of the upper surface of the table 2 in the same manner as the above-described disk table. The fitting member 4 is formed substantially in the shape of a truncated cone, is formed integrally with the table 2, and has an outer diameter that can fit into the center hole 102 of the disk 101.
The front end portion is formed as a taper portion 4a for pulling in the disk. The fitting member 4 has a straight cylindrical portion 4b at the base end portion on the side near the disk mounting surface portion 3. The cylindrical portion 4b has an outer diameter substantially equal to the inner diameter of the center hole 102.

On the distal end surface of the fitting member 4, a magnet mounting recess 13 is provided. Magnet mounting recess 1
Reference numeral 3 denotes a circular concave portion which is formed so that the center thereof coincides with the center of the fitting member 4. This magnet mounting recess 1
Reference numeral 3 denotes a magnet 9 serving as support means for the disk 101.
Are mounted so as to fit. Magnet 9
Is formed in a circular button shape. This magnet 9
Is for sucking a metal plate (not shown) attached to the center of the disk 101 so as to close the center hole 102. A magnetic yoke made of a material having high magnetic permeability may be provided on the lower surface side of the magnet 9, that is, between the magnet 9 and the fitting member 4.

The fitting member 4 has a magnet mounting recess 13.
Are provided with a plurality of notches 10.
These cutouts 10 are formed radially outside the magnet mounting recess 13 from the magnet mounting recess 13 to the base end side portion of the fitting member 4 and the disk-shaped portion of the table 2. These notches 10 are formed at equal angular intervals about the axis of the fitting member 4. In this example, the notches 10 are 3
It is provided in the place.

A centering ring 11 serving as a centering means is provided on the lower surface of the table portion 2.
Centering pieces 12, 12, 12 serving as centering members face each other in 0, 10, 10. The centering ring 11 is integrally formed by punching and pressing a plate-shaped spring material made of a metal material. As shown in FIG. 22, the centering ring 11 includes a substantially disk-shaped base portion 26 and three support protrusions 2 formed so as to rise upward from the periphery of the base portion 26.
9, 29, 29 and centering pieces 12, 1, which are provided on the outer side from the distal ends of the support projections 29, 29, 29.
2 and 12.

The base 26 has a through hole 27 at the center. The through hole 27 has an inner diameter that is sufficiently larger than the outer diameter of the drive shaft 1.

The supporting projections 29, 29, 29 are attached to the base 26.
Are installed vertically at equal angular intervals of 120 °. These support projections 29, 29, 29
6 is formed by bending a tongue piece projecting outward from the periphery of 6 by pressing. These support projections 29, 29, 29 have these support projections 29, 2
9 and 29, the squeezed portions 30, 30,
30 are formed respectively. These narrowing sections 30, 3
Numerals 0 and 30 are formed so that a part of the spring material forming the centering ring 11 forms a bulging portion of the ridge extending over each of the support projections 29, 29, 29 and the base 26. These constricted portions 30, 30, 30 are each
29 is prevented from tilting with respect to the base 26.

The base ends of the centering pieces 12, 12, 12 are connected to the distal ends of the support projections 29, 29, 29, respectively. These centering pieces 12, 1
The support projections 29, 29, 29 are located on the outer side of the support projections 29, 29, 29, that is, on the side separated from the base 26, and are directed downward from the distal end of each support projection 29, 29, 29. Is inclined. A pair of bent pieces 31, 31 are formed on the distal ends of the centering pieces 12, 12, 12, respectively. These bent pieces 31, 31 are the centering pieces 1
A pair of tongues protrude from both sides of the base 2, and are bent in a substantially arc shape toward the center of the base 26. These centering pieces 12, 12, 12 and each centering piece 1
The bent pieces 31, 31 of 2, 12, 12 are each formed by bending a member continuously provided in a plate shape from the supporting protrusions 29, 29, 29 by press working.

At the periphery of the base 26, notches 28 for adhesive are formed at equal angular intervals and between the supporting projections 29, 29. These adhesive cutouts 28 are substantially semicircular cutouts.

Each of the centering pieces 12, 12, 12 is inserted into each of the notches 10, 10, 10 by attaching the base 26 to the lower surface of the table 2. The base 26 is attached to the table 2 with the main surface of the base 26 in contact with the lower surface of the table 2 and an ultraviolet curable resin or the like is inserted into each adhesive cutout 28. This is performed by applying an adhesive. At this time, the distal end portions of the support protrusions 29, 29, 29 are located on the outer peripheral side of the magnet 9 and are separated from the magnet 9 and the fitting member 4. These centering pieces 12, 12, 12 can be elastically displaced.

Each centering piece 12, 12, 12 has its base end located near the distal end face of the fitting member 4 when the centering ring 11 is attached to the table 2, as shown in FIG. At the same time, it is supported to be inclined with respect to the disc mounting surface portion 3, and the front end portion protrudes outward from each notch portion 10, that is, in the outer peripheral direction of the fitting member 4. These centering pieces 12, 1
The front end portions of the centering pieces 12, 12,
Due to the elastic deformation of the base end portion 12, the fitting member 4 can come and go on the outer peripheral surface. The distal ends of the centering pieces 12, 12, 12 are located below the disk mounting surface 3 and abut against the inner wall of each notch 10. At this time, the centering pieces 12, 12, 1
Reference numeral 2 indicates a state in which the base 2 is slightly elastically displaced toward the base portion 26 from the initial state.

By the way, in order to manufacture a disk table having the centering ring 11 made of a leaf spring material as described above, as shown in FIG.
0 is used. The positioning jig 50 is provided with a concave positioning hole 51 in a block-shaped main body. A reference shaft 53 protrudes from the bottom of the positioning hole 51. The reference shaft 53 has an outer diameter substantially equal to that of the drive shaft 1 of the spindle motor 5. A part of the inner wall of the positioning hole 51 is formed as a centering piece contact wall 52, 52, 52 corresponding to the notch 10, 10, 10 of the table 2. Portions of the inner wall of the positioning hole 51 other than the respective centering piece contact walls 52, 52, 52 are in a state in which the diameter is expanded outward from the centering piece contact walls 52, 52, 52. Each centering piece contact wall 52,
52, 52 are formed so as to form a part of a cylindrical surface coaxial with the reference axis 53. The diameter of the cylindrical surface enclosing the centering piece contact walls 52, 52, 52 indicated by an arrow L in FIG. 23 is slightly smaller than the inner diameter of the center hole 102 of the disk 101, for example, the inner diameter of the center hole 102 is smaller. In the case of 11.00 mm, it is about 10.98 mm to 10.99 mm.

In the method of manufacturing a disk table according to the present invention, first, as shown in FIG. 23, the reference shaft 53 is fitted into the fitting hole 8 of the table 2 formed in the fitting member 4. . At this time, the reference shaft 53 is fitted into the fitting hole 8 with the fitting member 4 facing the positioning hole 51 such that the fitting member 4 is fitted into the positioning hole 51. You. At this time, the notches 10, 10, 10
Are in a state of facing the respective centering piece contact walls 52, 52, 52.

Next, the centering ring 11 is placed on the table 2 attached to the positioning jig 50. At this time, the centering ring 11 places the base portion 26 on the lower surface of the table portion 2 and
2, 12 and 12 are made to enter the respective notches 10, 10 and 10. Then, each centering piece 12, 12, 12
The center portion of each of the centering piece contact walls 52, 52,
The contact is made corresponding to 52. At this time, since the centering pieces 12, 12, 12 are in a state of being elastically displaced toward the base portion 26, the centering piece contact walls 5
2, 52, 52 are pressed by a resilient force. Therefore,
The centering ring 11 is provided with each centering piece 12, 1
Due to the resilience of 2,12 these centering pieces 1
The centering pieces 12, 12, 12 are moved to a position where the resiliences of the centering pieces 12, 12, 12 are balanced, that is, the positions where the resiliences of the centering pieces 12, 12, 12 are equal to each other. At this time, the support pieces 29, 29, 29, the magnet 9 and the fitting member 4
Are separated from each other, so that the movement of each centering piece 12, 12, 12 of the centering ring 11 due to the elastic force is not hindered.

The centering ring 11 is adhered to the lower surface of the table section 2 by an adhesive 32 at a position where the resilience of the centering pieces 12, 12, 12 is balanced, and is fixed to the fitting member 4. It is attached in the state that it was. The bonding of the centering ring 11 to the table portion 2 by the adhesive 32 is performed by dropping the fluid-like adhesive 32 into the adhesive cutouts 28, 28, 28, and applying the adhesive 32 to the centering ring 11 and the centering ring 11. No contact is made with both sides of the table part 2 and then the adhesive 32
Is carried out by curing. The curing of the adhesive 32 is performed by irradiation with ultraviolet light or heating.

The table section 2 includes a centering ring 11
Is removed from the positioning jig 50. The centering pieces 12, 12, 12 of the centering ring 11 attached to the table 2 in this manner are slightly displaced from the center hole 102 of the disk 101 and are displaced to an arc coaxial with the fitting hole 8. When they generate the same outward resilient force.

In order to place and mount the disk 101 on the disk mounting surface 3 in the disk table having the centering ring 11 made of a leaf spring material as described above, the disk 101 is moved downward in the direction of arrow C in FIG. Then, the center hole 102 is fitted into the fitting member 4.

When the disk 101 is moved toward the base end of the fitting member 4, as shown in FIG.
The inner wall of the center hole 102 of each of the centering pieces 12, 1
Contact 2 and 12. The inner wall portion of the center hole 102 is moved toward the base end side of the fitting member 4 while elastically deforming the centering pieces 12, 12, 12 so as to be immersed in the notches 10, 10, 10, respectively. . At this time, as shown by an arrow J in FIG. 25, each of the centering pieces 12, 12, 12 is positioned at a position where the front end of the centering piece is in contact with the inner wall of the notch 10, 10, 10, so that the center hole 102 has a larger diameter. It is elastically displaced to a position in contact with the inner wall. In addition, these centering pieces 12, 12, 12 press the inner wall portion of the center hole 102 outwardly by an elastic return force.

Then, as shown in FIG.
01 is fitted into the cylindrical portion 4b of the fitting member 4 and the peripheral portion surrounding the central hole 102 is placed on the
The inner wall portion 2 is centered by being pressed by the centering pieces 12, 12, 12, and the center of the center hole 102 coincides with the axis center of the fitting member 4.

At this time, the magnet 9 is
By sucking the metal plate 104 attached to the disc 1, the disc 101 is suction-supported on the disc mounting surface 3.

In this way, when the disk 101 is positioned and mounted on the table section 2 and the spindle motor 5 is driven to rotate the drive shaft 1, the disk 101
01 is rotated together with the table 2. On the disk 101, an information signal is written to the signal recording layer by an optical pickup device or a magnetic head device, and an information signal recorded on the disk is read.

By the way, each of the centering pieces 12, 12,
In order for the centering piece 12 to be satisfactorily centered even after the disk 101 is mounted on the disk mounting surface 3, the centering pieces 12, 12, 12
It is necessary to press the inner wall of the center hole 102 with a sufficiently large force. On the other hand, these centering pieces 12, 1
If the force for pressing the inner wall portions of the center holes 102 of the second and the second holes 12 is excessive, the force of the magnet 9 to attract the metal plate 104 can move the disk 101 to a position where the disk 101 contacts the disk mounting surface portion 3. Disappears. Therefore,
The spring constant k ₀ of each centering piece 12, 12, 12 is
A the minimum value k ₁ or the spring constant can sufficiently correct the eccentric for fitting member 4 of the disc 101,
Disk 101 is made less than the maximum value k ₂ of the spring constant can be moved to a position abutting the surface portion 3 mounting disc by a suction force to the metal plate 104 of the magnet 9.

Here, each centering piece 12, 12, 1
Let k be the spring constant of 2. Each centering piece 12, 1
Let Δx be the displacement amount of the centering pieces 1 and 2.
The friction coefficient between the 2,12,12 and the inner wall portion of the central hole 102 of the disc 101 and mu _1, the friction coefficient between the disk 101 and the disk mounting face portion 3 and mu _2. When the inner wall portion of the center hole 102 comes into contact with each of the centering pieces 12, 12, 12,
As shown in FIG. 25, the magnet 9 shown by the arrow F in FIG.
Center hole 102 of centering piece 12 indicated by middle arrow kΔx
A normal force kΔx against the inner wall portion is applied. Then, the center hole 102 of each of the centering pieces 12, 12, 12 is formed.
25, the inclination angle of the portion where the inner wall portion abuts is indicated by an angle θ from the horizontal plane as indicated by an arrow θ in FIG. Then, the three centering pieces 12, 12, 12 are provided, the maximum value _{k 2,} from _{F = μ 1 k 2 ΔxSinθ +} k 2 ΔxCosθ ··· ( Equation _{3), k 2 = F /} {Δx (Μ ₁ Sin θ + Cos θ)｝ (Equation 4) Since k ₀ <k ₂ , k ₀ <F / {Δx (μ ₁ Sin θ + Cos θ)} (Equation 5)

[0088] In addition, the minimum value of _{k 1} is disk 1
01 is D with respect to the fitting member 4, and the disc 1
When a force tending to move to the center 01 and the moving force _{C, C = 2k 1 (Δx} + DCos60 · Sinθ) Sinθ · Cos60- k 1 (Δx-DSinθ) Sinθ = (3/2) k 1 DSin 2 θ · (Equation 6) Further, the resistance R to the movement of the disk 101 is as follows: R = μ ₂ (3F−k ₁ ΔxCosθ) (Equation 7) In order for the disk 101 to move, the moving force C is It must be greater than the resistance R. Therefore, (3 /
Than ^{_{2) k 1 DSin 2 θ>}} μ 2 (3F-k 1 ΔxCosθ), k 1 = 6μ 2 F / (3DSin 2 θ + 2μ 2 ΔxCosθ) ··· ( Formula _{8), and} because it is k 1 _{<k 0} , K ₀ > 6 μ ₂ F / (3D sin ² θ + 2 μ ₂ ΔxCos θ) (Equation 9).

The spring constant of each centering piece 12, 12, 12 determined in this way is
Since 2, 12, 12 are formed from a spring material, the centering piece 12 can be made approximately five times the spring constant when formed from a synthetic resin material.

As described above, in the disk table using the centering ring 11 made of a spring material, the centering pieces 12, 12, 12 can center the disk 101 satisfactorily. In addition, each centering piece 1
2, 12, 12 have cutout portions 10, 10, 1 at the tip end.
0, so that even if there is an error in the spring constant, the center hole 102
The variation in the pressing force against the inner wall portion is small. Furthermore, each centering piece 12, 12, 12
In the initial state in which the disk 101 is not mounted, the position is regulated by the inner wall portions of the notches 10, 10, 10, and therefore, the positioning is performed with high accuracy.

The centering pieces 12, 12, 12
Is made of a metal material, so that it has good so-called creep resistance and good durability in a high-temperature environment. Furthermore, these centering pieces 12, 12, 1
No. 2 is easier to form with an accurate spring constant than when formed from a synthetic resin material.

Each of the centering pieces 12, 12, 12 has a bent piece 31, 31.
2 is bent in a substantially arc shape toward the base portion 26 side, so that the inner wall portion of the center hole 102 is not damaged, and the disc mounting surface portion 3 of the disc 101 is not damaged. Movement to the side can be performed smoothly.

In the case where the disk table according to the present invention is constructed using the centering ring 11 made of the above-described spring material, the centering ring 12 is not provided with the bent pieces 31, 31 as shown in FIG. , 1
A contact member 34 made of a synthetic resin material may be adhered to the front end portions 2 and 12. These contact members 34
The centering pieces 12, 12, 12 can be adhered and formed by means such as so-called outsert molding. These contact members 34 are attached to the respective centering pieces 12, 1.
In the initial state where the disk 101 is not mounted, the base portion of the fitting member 4 projects outward from the fitting member 4 in the initial state where the disk 101 is not mounted. Have been.

Also in this disk table, the centering pieces 12, 12, 12 can smoothly move the disk 101 to the disk mounting surface 3 side without damaging the inner wall of the center hole 102. it can.

[0095]

As described above, according to the present invention, the fitting member is fitted into the center hole of the disc from the front end side.
Centering of the disk with respect to the disk table can be performed reliably.

Since the base end portion of the fitting member is formed in a columnar shape, the inner wall of the center hole is not affected by impact or vibration when the disc is placed on the table. Since the base end portion of the fitting member can be securely brought into contact with the portion and supported, the movement of the disk with respect to the table portion can be suppressed, and more reliable centering can be achieved.

The centering means is constituted by a plurality of leaf spring-shaped centering members arranged so as to be able to protrude and retract from the outer peripheral surface of the fitting member, and is formed integrally with the fitting member to simplify the structure. Can be planned.

Further, each centering member is displaced inward of the fitting member, and the return to the initial state is regulated and disposed by the regulating portion provided at the center side of the table portion. Then, the centering member can exert a sufficient pressing force on the disk even if the spring constant is small, and the fluctuation of the pressing force on the disk due to the error of the spring constant can be reduced, and a stable disk can be obtained. Centering can be performed.

Further, when the centering member is made of a metal leaf spring material, the centering member has excellent durability even under environmental conditions where temperature changes are remarkable, and has a small error even when the spring constant is increased. Good characteristics can be realized.

Further, the centering member is constituted by a leaf spring made of a metal material, and both side portions of the abutting portion abutting against the inner wall portion of the center hole of the disk are formed in a substantially arc shape toward the center of the fitting member. When the disk is curved as described above, smooth loading and unloading can be achieved without damaging the disk.

Therefore, according to the present invention, it is possible to reliably center the disk while simplifying and reducing the thickness of the apparatus, and furthermore, it is possible to suppress the influence of external vibrations and shocks.

[Brief description of the drawings]

FIG. 1 is a plan view showing a disk table on which the present invention is based.

FIG. 2 is a longitudinal sectional view of the disk table.

FIG. 3 is an exploded perspective view of the disk table.

FIG. 4 is an enlarged longitudinal sectional view of a main part showing a main part configuration of the disk table.

FIG. 5 is an enlarged vertical sectional view of a main part showing a state where mounting of a disk on the disk table is started.

FIG. 6 is an enlarged vertical sectional view of a main part showing a state in which a disk is being mounted on the disk table.

FIG. 7 is an enlarged vertical sectional view of a main part showing a state in which mounting of a disk on the disk table is completed.

FIG. 8 is a plan view showing an example of a disk table according to the present invention, in which a fitting member and a centering member are integrally formed.

9 is a longitudinal sectional view of the disk table shown in FIG.

FIG. 10 is an exploded perspective view showing an example in which the disk table according to the present invention is configured using a plurality of clamp members as pressing support means.

11 is a longitudinal sectional view showing the disk table shown in FIG. 10 and a disk cartridge mounted on the disk table.

FIG. 12 is a longitudinal sectional view showing a state in which a disk cartridge has been mounted on the disk table shown in FIG. 10;

13 is a longitudinal sectional view showing a state where the clamp member is at the neutral position while the disk cartridge is being mounted on the disk table shown in FIG. 10;

14 is a longitudinal sectional view showing a state where the clamp member is urged downward while the disk cartridge is being mounted on the disk table shown in FIG. 10;

15 is a longitudinal sectional view showing a state where the mounting of the disk cartridge on the disk table shown in FIG. 10 is completed.

FIG. 16 shows another example of the disk table according to the present invention, and is an enlarged longitudinal sectional view of a main part showing a state where mounting of a disk on the disk table is started.

FIG. 17 is an enlarged longitudinal sectional view of a main part showing a state in which mounting of the disk on the disk table shown in FIG. 16 is completed.

FIG. 18 is still another example of the disk table according to the present invention, and is an enlarged vertical sectional view of a main part showing a state where mounting of a disk on the disk table is started.

19 is an enlarged longitudinal sectional view of a main part showing a state in which the mounting of the disk on the disk table shown in FIG. 18 is completed.

FIG. 20 is a plan view showing an example in which the disk table according to the present invention is configured using a centering member made of a leaf spring material made of a metal material.

21 is a longitudinal sectional view showing the disk table shown in FIG.

FIG. 22 is an exploded perspective view showing the disc table shown in FIG.

FIG. 23 is a perspective view showing a manufacturing process of the disk table shown in FIG. 20;

24 is an enlarged longitudinal sectional view of a main part showing a state where the disk is being mounted on the disk table shown in FIG. 20;

FIG. 25 is an enlarged longitudinal sectional view of a main part showing a state in which mounting of a disk on the disk table shown in FIG. 20 is completed.

FIG. 26 is an enlarged longitudinal sectional view of a main part showing another example in which the disk table according to the present invention is configured using a centering member made of a leaf spring material made of a metal material.

[Explanation of symbols]

2 Table part, 3 Disk mounting surface part, 4 Fitting member, 4a Tape pull-in part for disk, 4b cylindrical part, 9 Magnet, 8 Fitting hole, 10 Notch, 11 Centering ring, 12 Centering piece, 19 Clamp Member, 31 bent pieces,
50 positioning jig, 51 positioning hole, 52 centering piece contact wall, 53 reference axis, 101 disk, 102 center hole

Claims (8)

[Claims] An inner wall portion of a center hole of a disk is slidably contacted on a distal end side to form a taper portion for pulling in the disk to guide the disk toward a center side, and a base end side is formed in a columnar shape. A fitting member having a notch formed therein, and a table portion provided integrally with the fitting member on the base end side of the fitting member, on which a peripheral portion of a center hole of the disk is placed. A magnet provided on a distal end side of the fitting member and for attracting a metal plate attached to a center portion of the disc; and a magnet provided on the plurality of cutouts formed in the fitting member. Centering means for pressing the inner wall portion of the center hole of the disc by a plurality of spring portions disposed so as to be able to protrude and retract in the radial direction to match the center of the disc with the center of the fitting member, Above magnet is up Disk suction force for sucking a metal plate: F Normal force of the spring portion against the inner wall portion of the center hole: N Pressing force applied by the inner wall portion of the center hole to the spring portion: f Number of spring portions: n When the inclination angle of the outer side surface portion with respect to the main surface portion of the disk is θ, when the spring portion is pressed with a pressing force f calculated by f = NSinθ = (F / n) (Sinθ / Cosθ), The disk table, wherein the spring portion is formed so as to be displaced by an amount of protrusion from the fitting member on a plane including the table portion. 2. The disk table according to claim 1, wherein said spring portion is constituted by a metal leaf spring member. 3. The spring portion according to claim 1, wherein both side portions of the abutting portion abutting against the inner wall portion of the center hole of the disk are curved in an arc shape toward the center of the fitting member. 2. The disk table according to 2. 4. The disk table according to claim 2, wherein said spring portion is provided with a contact member made of a synthetic tree material on a tip end side. 5. A disk table on which a disk is mounted, mounted on a spindle motor and driven to rotate,
In a recording and / or reproducing apparatus provided with a recording and / or reproducing means for recording and / or reproducing information signals on the disk mounted and rotated on the disk table, the disk table has a disk A fitting member in which the inner wall portion of the center hole is slidably contacted to form a taper portion for drawing in the disk to guide the disk toward the center side, the base end side is formed in a columnar shape, and a plurality of notches are formed around the periphery. A table portion disposed integrally with the fitting member on the base end side of the fitting member and on which a peripheral portion of a center hole of the disc is placed; and a table portion provided on the distal end side of the fitting member. A magnet attached to a central portion of the disk for attracting a metal plate; and a plurality of cutouts formed in the fitting member, which can be radially protruded and retracted from the fitting member. Centering means for pressing the inner wall portion of the center hole of the disc by a plurality of spring portions disposed so as to match the center of the disc with the center of the fitting member. Disc suction force for suction: F Normal force of the spring portion against the inner wall portion of the center hole: N Pressing force applied by the inner wall portion of the center hole to the spring portion: f Number of spring portions: n Number of spring portions outside the spring portion When the inclination angle of the disk with respect to the main surface portion is θ, f = N sin θ = (F / n) (Sin θ / Cos θ) When the spring portion is pressed with the pressing force f calculated as The recording and / or reproducing apparatus, wherein the spring portion is formed so as to be displaced by a protruding amount from the fitting member on a plane including the spring member. 6. The recording and / or reproducing apparatus according to claim 5, wherein said spring portion is constituted by a leaf spring member made of metal. 7. The spring portion, wherein both side portions of an abutting portion abutting against an inner wall portion of a center hole of the disk are curved in an arc shape toward the center of the fitting member. 7. The recording and / or reproducing apparatus according to 6. 8. The recording and / or reproducing apparatus according to claim 6, wherein a contact member made of a synthetic tree material is provided on a tip side of the spring portion.